D150 Dead with black screen - need help

Hi,

i have an Acer Aspire One D150 and it seems to be dead. Yesterday, it runs perfectly first. I left the room for a couple of minutes, returned to the Acer and wonder myself, that it was powered off. When i press the power button the power-led goes on, the fan gives a short whirling sound and then stops. The screen stays black. Nothing happens...

So i searched the net and found many posts with the same symptoms where people had luck with a BIOS-recovery procedure. I tried the same but it fails i think. The procedure i tried is:

- copy the specific biosfiles downloaded from Acer on a Stick
- rename the biosrom-file to ZG5IA32.FD
- plug in battery and AC-adapter to Acer <- "I tried it with and without plugged AC and had different behaviors described below"
- plug in stick
- start with Fn-Esc + Power pressed
- release Power-Button
- release Fn-Esc
- the Power-Led should now blink <- "but on my Acer it simply stays on"
- when Power-Led blinks, press Power-Button again <- "so i ignored the led and pressed it again cause i've read a post from someone who sees no blinking led too and it worked for him to blindly resume with the procedure"
- Acer should start and boot after a short while <- "well, my acer does nothing":-(

The Acer shows the above behavior when it runs only on battery and no AC is plugged in, contrary to the original procedure, where AC have to be plugged in too. If i run the procedure with plugged in AC the Acer behaves like no Fn-Esc is pressed. The power-led goes on, the fan whirls for 3 seconds, stops and nothing more happens. I have no idea anymore...

Could someone please Help or give advice. How is the correct behavior of an Acer D150 when starting with Fn-Esc and AC plugged in or not? How is the behavior if no readable Stick is found?

Thanks and regards